Stanford University
APPLIED PHYSICS/PHYSICS COLLOQUIUM

Tuesday January 7, 2020
4:30 p.m. on the Hewlett Teaching Center campus, room 200

Amir Yacoby
Harvard University

“Quantum Detection of Quantum Materials”

Spin- and current-generated magnetic fields provide a unique window into the physics of correlated electron materials and devices. Proposed only a decade ago, electron spin-based magnetometry of nitrogen vacancy (NV) defects in diamond appears to be an exceptionally well-suited platform for probing condensed matter systems: it can operate from cryogenic to above room temperature, has a dynamic range from DC to GHz, and allows sensor-sample distances as small as a few nanometers. As such, NV magnetometry provides access to static and dynamic magnetic and electronic phenomena with nanoscale spatial resolution. While pioneering work focused on proofs of principle of its nanoscale imaging resolution and magnetic field sensitivity, experiments are now beginning to probe the correlated electron physics of magnets and superconductors and explore current distributions in low-dimensional materials. In this talk, I will review some of our recent work that uses NV center magnetometry to image skyrmions in thin magnetic films, measure the spin chemical potential in magnetic insulators, and image the hydrodynamic flow of electrons in graphene.

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